Last modified: Feb. 27, 2021, 1:59 p.m.
This very rare species has been discovered for the first time in Belgium in 2017 in the easternmost part of the country (LG), where it has a stable population.
In this species, having a wingspan of 30–38 mm, male and female have a similar wing drawing with a characteristic marble-like pattern. This species can easily be distinguished from the other Hepialidae species by the chequered fore- and hindwing fringes. The antennae are strikingly short and the moths lack functioning mouth parts so they cannot feed.
The caterpillar is yellowish white, has a reddish-brown head and orange-brown thoracic plates. The lateral sides carry distinctive blackish stigmata.
The larva feeds on the roots of its hostplant, hibernates twice and pupates in the ground. The adults are active from dusk onwards and, later on, come to light.
The adults fly from late May till the beginning of July.
The larva feeds mainly in Pteridium aquilinum but sometimes also other food plants are taken. Also Festuca rubra is mentioned in literature.
This species prefers open woodland, rough pastures, moorland and heathland.